Makefile: Add default task (#1519)
Makefile: Add default task (#1519)



spongedu/tidb,ngaut/tidb,ueizhou/tidb,louishust/tidb,ngaut/tidb,cosmtrek/tidb,yuanwhy/tidb,Nify/tidb,liyu4/tidb,8cbx/tidb,pingcap/tidb,mccxj/tidb,JinheLin/tidb,simon-xia/tidb,qiuyesuifeng/tidb,kyle-wang/tidb,c4pt0r/tidb,gaocegege/tidb,anywhy/tidb,wusphinx/tidb,pingcap/tidb,zs634134578/tidb,zimulala/tidb,yuanwhy/tidb,Nify/tidb,andelf/tidb,EvilMcJerkface/tidb,wusphinx/tidb,kyle-wang/tidb,louishust/tidb,c4pt0r/tidb,Cofyc/tidb,astaxie/tidb,yangwenmai/tidb,ueizhou/tidb,ming-relax/tidb,CodeRushing/tidb,tiancaiamao/tidb,zimulala/tidb,c4pt0r/tidb,yangwenmai/tidb,coocood/tidb,silentred/tidb,silenceper/tidb,silentred/tidb,qhsong/tidb,simon-xia/tidb,EvilMcJerkface/tidb,tiancaiamao/tidb,astaxie/tidb,c4pt0r/tidb,pingcap/tidb,qhsong/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,coocood/tidb,mccxj/tidb,cosmtrek/tidb,pingcap/tidb,silenceper/tidb,XuHuaiyu/tidb,c4pt0r/tidb,zs634134578/tidb,XuHuaiyu/tidb,ming-relax/tidb,qiuyesuifeng/tidb,CodeRushing/tidb,myrice/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,spongedu/tidb,liyu4/tidb,ngaut/tidb,myrice/tidb,andelf/tidb,anywhy/tidb,8cbx/tidb,pingcap/tidb,JinheLin/tidb,Cofyc/tidb,pingcap/tidb,gaocegege/tidb